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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Vector-velocity estimation in swept-scan using a K-space approach
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Vector-velocity estimation in swept-scan using a K-space approach

机译：使用K空间方法的扫掠矢量速度估计

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摘要

The swept-scan technique (i.e., continuously moving a single-crystal transducer during pulse-echo data acquisition) is used in high-frequency, ultrasonic flow imaging. Relative to the conventional step-scan technique, swept scanning improves the rate of data acquisition and enables near-real-time, high-frequency color flow mapping. However, the continuous transducer movement may have nonnegligible effects on accuracy of velocity estimation. This paper introduces a spatial frequency domain (i.e., k-space) approach that quantifies the effects of both lateral and axial motions in a swept scan. It is shown that the k-space representation is equivalent to a Doppler-radio frequency (RF) frequency domain representation, and that transducer movement in the swept-scan technique results in a change in Doppler bandwidth. In addition, a vector velocity estimator is developed based on the proposed k-space approach. Both simulations and flow-phantom experiments were performed to evaluate the performance of the proposed vector velocity estimator. A 45-MHz transducer was scanned at 20 mm/s. The Doppler angle ranged from 29/spl deg/ to 90/spl deg/, and the flow velocities ranged from 15 to 30 mm/s. The results show that the proposed k-space vector velocity estimator exhibited a mean error of 2.6/spl deg/ for flow-direction estimation, with the standard deviation ranging from 2.2/spl deg/ to 8.2/spl deg/. In comparison, for the conventional spectral-broadening-based vector velocity estimator ignoring the swept-scan effect, the mean error became 15/spl deg/ and the standard deviations were from 2.7/spl deg/ to 6.6/spl deg/.
机译：扫频扫描技术（即在脉冲回波数据采集期间连续移动单晶换能器）用于高频超声流成像。相对于传统的步进扫描技术，扫频扫描提高了数据采集速率，并实现了近实时的高频色流映射。但是，换能器的连续运动可能会对速度估计的准确性产生不可忽略的影响。本文介绍了一种空间频域（即k空间）方法，该方法可量化扫掠扫描中横向和轴向运动的影响。结果表明，k空间表示等效于多普勒射频（RF）频域表示，并且扫频扫描技术中的换能器运动会导致多普勒带宽发生变化。另外，基于提出的k空间方法，开发了矢量速度估计器。仿真和流幻象实验都进行了评估所提出的矢量速度估计器的性能。以20 mm / s的速度扫描45 MHz的换能器。多普勒角度范围为29 / spl deg /至90 / spl deg /，流速范围为15至30 mm / s。结果表明，提出的k空间矢量速度估计器在流向估计中表现出2.6 / spl deg /的平均误差，标准偏差在2.2 / spl deg /至8.2 / spl deg /的范围内。相比之下，对于忽略扫频扫描效应的传统基于频谱扩展的矢量速度估计器，平均误差变为15 / spl deg /，标准偏差从2.7 / spl deg /至6.6 / spl deg /。

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